(1) export .obj format and then download and install the free DAZ3D modeling program DAZ studio.

(2) Autodesk has a free DWF viewer. So you could export DWF and use that viewer although I have never been able to get the DWF export/import to work and have sent autodesk a ton of posts both to tech support directly and on the forums and have never received any replies.

(3) DWG lots of DWG viewers. One probem autodesk took dwg export out of maya at 8.5. Which totally screwed veteran nurbs modelers because it is the only way to correct a NURB parameterization problem that has been in Maya from version 1.0! Once again I have sent tons of emails to Autodesk and posted in the forum and .... guess what??? .... No REPLIES!